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  • 1
    Online Resource
    Online Resource
    Facile Synthesis of Eco‐Friendly Silver@Graphene Oxide Nanocomposite for Optical Sensing
    Wiley ; 2023
    In:  ChemistrySelect Vol. 8, No. 5 ( 2023-02-03)
    Details
    In: ChemistrySelect, Wiley, Vol. 8, No. 5 ( 2023-02-03)
    Abstract: In this study, silver nanoparticles‐doped graphene oxide (AgNPs@GO) nanocomposite was green synthesized using the extract of Curcuma longa as an effective reducing and stabilizing agent.. Characterization of AgNPs and AgNPs@GO were thoroughly examined via several analysis methods. Thereby, the results show the successful formation as well as the uniform distribution of spherical nano‐sized silver fragments on the GO surface with an average size of 21.14 3.21 nm. The materials were then tested regarding their optical sensing for H 2 O 2 and Hg 2+ . In specific, AgNPs@GO indicated a great colorimetric detection towards H 2 O 2 and Hg 2+ with a remarkably low detection limit at 0.48 and 0.158 μM, respectively. Conclusively, AgNPs@GO nanocomposite poses a high potential in application sectors of the colorimetric sensor.
    Type of Medium: Online Resource
    ISSN: 2365-6549 , 2365-6549
    URL: Issue
    URL: Article
    DOI: 10.1002/slct.v8.5
    DOI: 10.1002/slct.202204183
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2844262-3
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  • 2
    Online Resource
    Online Resource
    Optimization of Conditions for Removal Phenolic Compounds from Water by a Graphene Oxide Aerogel
    Wiley ; 2022
    In:  ChemistrySelect Vol. 7, No. 26 ( 2022-07-14)
    Details
    In: ChemistrySelect, Wiley, Vol. 7, No. 26 ( 2022-07-14)
    Abstract: In this study, graphene oxide (GO) was prepared from graphite by improved Hummers’ method. Graphene oxide aerogel (GOA) was synthesized via the ice segregation induced self‐assembly method. Various modern analytical methods were utilized to characterize GOA. The results revealed the aerogel structure with a pore size of 100–150 μm, a specific surface area of 515.21 m 2 /g, and a pore volume of 2.08–2.16 cm 3 /g. The synthesized GOA was applied as an adsorbent for the removal of phenol (PN) and bisphenol A (BPA) with a maximum adsorption capacity of 117.65 and 70.17 mg/g, respectively. Response surface methodology involving a rotating central composite design was applied to investigate simultaneously the effects of adsorption variables including adsorption time, pH, and initial concentration on the removal efficiency of GOA for PN or BPA. The results showed that the optimal adsorption efficiency for PN was 92.15 % with an adsorption time of 208.52 min, a pH of 6.08, and an initial PN concentration of 30 mg/L. Regarding BPA, the optimal adsorption efficiency was 95.27 % with an adsorption time of 352.79 min, a pH of 4.91, and an initial BPA concentration of 20 mg/L. The adsorption of both PN and BPA onto GOA was appropriate with the Langmuir model, in which the maximum adsorption capacity of GOA for PN and BPA was 117.65 and 70.175 mg/g, respectively. The results confirmed that the adsorption of PN and BPA onto GOA was monolayer adsorption on a homogeneous surface. The adsorption mechanism of GOA for PN or BPA depended mainly on the electrostatic interaction and hydrogen bonding between −OH of PN, BPA, and oxygen‐containing functional groups of GOA. Besides, π‐π interaction between carbon rings of GOA and PN or BPA also contributed to the enhancement of adsorption performance. The results showed that GOA exhibited potential application in the treatment of organic pollutants. Besides, the evaluation of the morphology of the GOA and the simultaneous effects of different factors can contribute to the advancement of graphene‐based materials and the improvement of wastewater treatment.
    Type of Medium: Online Resource
    ISSN: 2365-6549 , 2365-6549
    URL: Issue
    URL: Article
    DOI: 10.1002/slct.v7.26
    DOI: 10.1002/slct.202104563
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2844262-3
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  • 3
    Online Resource
    Online Resource
    Surface modification of poly(propylene) fabric with graphene oxide‐based silver nanoparticles for antibacterial applications
    Wiley ; 2022
    In:  Journal of Applied Polymer Science Vol. 139, No. 45 ( 2022-12-05)
    Details
    In: Journal of Applied Polymer Science, Wiley, Vol. 139, No. 45 ( 2022-12-05)
    Abstract: Herein, poly(propylene) (PP) was hydrophilized with oxidating agents and solvents, followed by dip‐coating with silver nanoparticles anchored GO sheets (Ag@GO) prepared by the in‐situ method as reported in our previous study to obtain silver@graphene oxide‐coated poly(propylene) (Ag@GO/PP). The impact of the modifying agents, dipping times, and coating concentrations on the antibacterial activities were studied accordingly via the inhibition zone method. The fabrics were re‐hydrophobized with the reduction of Ag@GO and the functionalization with stearic acid (SA) to form silver@reduced graphene oxide‐coated poly(propylene) (Ag@rGO/PP) and silver@graphene oxide/SA‐coated poly(propylene) (Ag@rGO‐SA/PP), respectively. Characterization of pretreated and modified PP samples was carried out by various modern analysis methods. Simultaneously, the cytotoxicity of the active layers, the release of Ag + ions, and durability after washing were also investigated. The obtained results representing PP fabrics pretreated with HNO 3 /isopropanol and dipped in Ag@GO concentration of 2 g/L four times prove a sufficient approach for improving hydrophilization and bio‐compatibility for the PP samples. The fabrics greatly show an impressive interaction with precursors, mostly high antibacterial activity even after four washing cycles via appropriate releasing of Ag + to ensure the safety in usage. They further suggest that the prepared fabrics could be utilized for actual application as a face mask.
    Type of Medium: Online Resource
    ISSN: 0021-8995 , 1097-4628
    URL: Issue
    URL: Article
    DOI: 10.1002/app.v139.45
    DOI: 10.1002/app.53119
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1491105-X
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